Sorry to disappoint you but the Cubans do not stamp
passports, I presume so nobody can get into hot water for
having been there. Enjoy Cuba, they are very friendly even
in the airport. They had a lovely time poring over my
various visas and immigration stamps, mostly the more
attractive ones from South East Asia. Someone once remarked
that the more repressive the regime the more elaborate and
impressive the visa, they could be right.